No wrong. Mutation does not take a long time, but Evolution does. Evolution is the progression of a species of organisms, from one form to a superior form, which is better suited to survival in its environment, via mutation of genetic information, and inheritance of selected traits. If you read what I said you would realise that mutation does not always guarantee superiority, and more often than not mutations are detrimental, therefore the process of a single organism evolving may not take long(a single generation - take down syndrom people for instance, one single mistake[three instead of two of the 23rd chromosome] makes them so radically different from a normal person), but a whole population may take thousands even millions of years depending on reproduction rate and mating partner selection processes.